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Related Experiment Video

Updated: Feb 15, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Iodine-stabilized single-frequency green InGaN diode laser.

Yi-Hsi Chen, Wei-Chen Lin, Jow-Tsong Shy

    Optics Letters
    |January 13, 2018
    PubMed
    Summary

    A new 520-nm Indium Gallium Nitride (InGaN) diode laser offers a compact, stable, single-frequency green laser beam. This laser system provides a reliable frequency reference, potentially replacing larger, conventional systems.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Spectroscopy

    Background:

    • Conventional green lasers often rely on diode-pumped solid-state (DPSS) technology, which can be bulky and less efficient.
    • Developing compact and stable single-frequency laser sources is crucial for various precision measurement and referencing applications.

    Purpose of the Study:

    • To investigate the performance of a 520-nm Indium Gallium Nitride (InGaN) diode laser for single-frequency operation.
    • To stabilize the laser frequency using iodine transitions for use as a frequency reference.
    • To explore the operational characteristics of the InGaN diode laser.

    Main Methods:

    • Utilized a 520-nm InGaN diode laser operating above its lasing threshold.
    • Employed saturated absorption spectroscopy to stabilize the laser frequency onto an iodine hyperfine transition.

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  • Investigated the laser's sensitivity to diode temperature and current for frequency tuning and stability.

    • Main Results:

    • Achieved milliwatt-level, single-frequency laser output from the InGaN diode laser.
    • Demonstrated fine-tuning of laser frequency via applied current with reduced sensitivity to temperature.
    • Attained frequency stabilization uncertainty of approximately 8×10-9 with a 10-s integration time.
    • Characterized the single longitudinal mode operational region concerning diode temperature, current, and output power.

    Conclusions:

    • The 520-nm InGaN diode laser provides a compact and stable single-frequency green laser source.
    • This laser system shows potential as a frequency reference, offering an alternative to conventional DPSS lasers.
    • The developed system demonstrates robust frequency stabilization suitable for precision applications.